جستجوی مقالات مرتبط با کلیدواژه « rock-eval 6 pyrolysis » در نشریات گروه « زمین شناسی »

In this study, the organic facies and depositional environments of the Pabdeh Formation are investigated in the Rag-e-Sefid Oilfield located in the southern Dezful Embayment. Little information exists about the organic facies properties of this source rock in the Zagros basin. In the present study, a total of 4 cutting samples were collected from well No. 99 of the Rag-e-Sefid Oilfield. These samples are characterized by a combination of Rock-Eval pyrolysis and organic petrographic techniques. Based on the diagrams of Tmax versus HI, the studied samples contain type II/III kerogen with thermal maturity corresponding to the early stages of the oil generation window. Organic petrographic results are consistent with the presence of a highly organic-rich zone in the middle parts of the Pabdeh Formation, while the upper and lower parts are poor in organic matter. The organic-rich part of the Pabdeh Formation contains abundant amorphous organic matter, bituminite, and framboidal pyrite typical of anoxic depositional environment. The organic-poor sections on the other hand contain negligible organic matter with euhedral secondary pyrite in a light-colored matrix, which suggests oxic depositional condition. These observations suggest that different parts of the Pabdeh Formation were deposited under different environmental conditions. Only the middle part of the Pabdeh Formation has considerable potential for hydrocarbon generation.

In this study, the hydrocarbon potential and depositional environments of the Laffan Formation in the Binak Oilfield is investigated. Rock-Eval pyrolysis results indicate that the Laffan Formation contains a mixed type II/III kerogen. Based on the classification of the source rock in terms of total organic carbon (TOC) content, the Laffan Formation can be classified as a good to very good source rock. According to the plots of S1+S2 versus TOC, the Laffan Formation has weak to excellent hydrocarbon potential in the Binak Oilfield. However, organic petrographic inspections showed that the main components of the organic matter are inertinite, bituminite along subordinate amounts of amorphous organic matter. The predominance of Inertinites together with minor Liptinites confirms the type II and IV kerogen mixture in the studied formation. It is noteworthy that the presence of bituminite has a noticeable impact on the results of Rock-Eval pyrolysis. Therefore, in this study, the organic geochemistry of the Laffan Formation was evaluated using organic petrographic results. Accordingly, it is concluded that the organic matter in the Laffan Formation consists mainly of inertinite and bituminite with minor amounts of Liptinites. Therefore, significant hydrocarbon generation potential cannot be expected from this formation in the Binak Oilfield. Considering the public shape of the chromatograms obtained from PY-GC analysis, which show that the initial depositional environment of the Laffan Formation was predominantly oxic marine. The results of this study can be useful for better understanding the Cretaceous hydrocarbon system in the study area.